St. Bartholomew's Church is one of the oldest church buildings in Ljubljana. The church was first mentioned in 1370, when in front of it a peace treaty between the Doge of Venice and Leopold III and Albert III of Habsburg was concluded by their representatives on 30 October 1370, in which the Austrians agreed to return the city of Trieste for the compensation of 75,000 florins.
In 1526, its valuables were donated to a fund for improving the city's defenses against Turkish attacks. In the end of 15th century and beginning of 16th, it was a venue of Protestant liturgy and was during Slovene anti-reformation in 1618, it was reclaimed as a Roman Catholic church. In 1825, it was damaged by fire and restored several times.
Some elements of the original Romanesque church have been preserved, among them the portal on the northern side. Between 1933-36, the church was partially redesigned according to plans by Jože Plečnik.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.